On the Silk Road, these lost twin cities may have sustained themselves in a foreboding landscape with metallurgy and commerce ...
Supermassive black holes can expel jets of material so vast and powerful that they may shape the large-scale structure of the ...
An issue on cities: how they arose, how they are evolving in various circumstances, how they shape themselves. More than half the world's people will probably be living in cities of 100,000 or ...